Bach Man, your advice from my previous post was good enough to drop some coin on a Brill Trolley, p/n 61093.  The 7" radius was still a bit large to deal with when engineering an N scale town, so I took a leap of faith and experimented with going down to 3.25" with flex track,(and the lid from a Folger's coffee can!) and found that the trolley worked fine with no binding and no underbody modifications.  Though this may not be prototypical and suicidal at high speeds, that issue was offset by the increased workability into the town.  In analog, the Trolley works fine, even at prototypical slow speeds, and enhanced the idea of a layout within a layout. And keeping it simple. Thanks!

I'm building an N scale town and considering the addition of a trolley system. What is the minimum curve radius for Brill and PCC trolleys? The layout is engineered for the addition of DCC at a later date. How much trouble will I have with the conversion of these two items?